20 Gallon Stocking Suggestions

[Murray]

I have one small male krib, six lemons and 3 cardinals in my 20 gallon as it stands, id like to move the krib and add some fish to the tank. I was thinking id add 3 more cardinal tetras but was unsure what else to add. Any suggestions?

EDIT: there is an aqua clear 30 filter and an aqua clear 30 powerhead hooked up to an undergravel filter for filtration...lots of filtering and water circulation.

 

[ALW]

Some more Cardinals for def, maybe add a Dwarf Gourami or two and a pair of Dwarf Otos, that would be about it then

 

[Murray]

Some more Cardinals for def, maybe add a Dwarf Gourami or two and a pair of Dwarf Otos, that would be about it then

wouldnt the dwarf gourami prefer to not be in such a filtered tank, with all the filtration there is a decent current. what other tetras would you guys reccomend for the tank, perhaps some black skirts, bleeding hearts, or rummy nose?